Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac0c42a6522fe8a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 13:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cccb841065f11eec97b7cdd491a8c9b0 SHA-1: 4b8f2bc32ca1b3e9c70e2ac4afffa081d88e507c SHA-256: 3ac0c42a6522fe8aa4ac575410ed9116a5478e6e1127bfbf3e8406fe86f33cfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=window+media+player+for+android+tablet PDF link annotation
    • https://stealthwindow.tw/uploads/files/202109100359478337.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/96076348541.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/77460145431.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/vasajejoxajazofekizikozu.pdfIn PDF document text
    • https://aneri12.eu/res/file/xivugas.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39431271942.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/5116368910.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/56604358582.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d292bd89261c0b300b5d3e5f90b4f45/kididozojaso.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe85b9c9---15583192267.pdfIn PDF document text
    • http://flomojapan.com/upload/files/67998103284.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/28658271709.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/bisewagivafanafaninumup.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/negijabigifeken.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/winavetimojukolitid.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/25111487094.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • http://amandamaitland.com/images/file/49283081285.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nefarelu.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/letapiguxukelamiga.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/26743259950.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/22976129423.pdfIn PDF document text
    • https://iwistw.com/upload/files/rutoxeja.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/pakufewefamakokiruwazidod.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/96337659308.pdfIn PDF document text
    • http://elpijisystem.com/file/55472041489.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/83946387829.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 18644 bytes
SHA-256: c99d720f80ea45d8a88d533049f6d4379c5ba92599470af879714fd88826cf9d
font_02_sfnt_off00013331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 10824 bytes
SHA-256: c9b18380820aa42b2b65cf187259b95aa6b45a4980a357aa9f7073e8ecc43c9a